AVAILABILITY AND USE OF DOMESTIC FLIGHTS: AIR PASSENGERS

AVAILABILITY AND USE OF DOMESTIC FLIGHTS: AIR PASSENGERS

Domestic Air Seat and Passenger Miles (monthly data, not seasonally adjusted)

Revenue passenger-miles are a measure of the volume of air passenger transportation.
Unused seat-miles (the difference between available seat-miles and revenue passenger
miles) are used as a measure of airline capacity utilization. Another measure
is the intensity of use of the equipment.

NOTE: A revenue passenger-mile is equal to one paying passenger carried one
mile. Available seat-miles for an individual flight are the number of seats multiplied
by the distance traveled. The data do not include international flights by U.S.
domestic carriers or domestic flights by foreign carriers.

Domestic Passenger Aviation

Jun-01

Jun-02

Available seat-miles (billions)

61.88

58.34

Available seat-miles percent change from same month previous year

3.28

-5.73

Revenue passenger-miles (billions)

46.65

44.06

Revenue passenger-miles percent change from same month previous year

-1.12

-5.57

Unused seat-miles (billions)

15.23

14.28

Unused seat-miles percent change from same month previous year

19.58

-6.25

NOTES: The current value is compared to the value from the same period in the
previous year to account for seasonality. The data have been adjusted to have
a standard 30-day month by multiplying the data for each month by the ratio: 30/(actual
days in month).

These indicators are components of the passenger and overall aircraft load
factors displayed in "Aircraft Utilization-Passengers and Freight."

The dramatic changes in the September 2001 data reflect the impact of the terrorist
attacks on Sept. 11, 2001, on aviation, including several days in which commercial
air operations were suspended.

Alaskan carriers that began reporting T100 data in January 2002 are excluded
from this report to retain comparability for comparisons with the previous year.

SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics,
Air Carrier Traffic Statistics Monthly, September 2002.